Pendulum scale



1,536,206 -W. N. GILBERT PENDULUM SCALE Filed July 13, 1920 2 Sheets-Sheet 1 May 5, 1925.

Muy 5, 1925.

1,536,206 w. N. :GILBERT PENDULUI SCALE 'Filed .1u-1y 13, 1920 2 sheets-sheet 2 BY WW Patented May 5, 1925.

UNITED STATES PATENT OFFICE.

eWILLIAIVI NATHAN GILBERT, OF DAYTON, OHIO, ASSIGNOR TO INTERNATIONAL SCALE COMPANY, OF DAYTON, OHIO, A CORPORATION OF ILLINOIS.

PENDULUM SCALE.

Application filed July 13,

To all whom it may concern.'

Be it known that I, IVILLIAM NATHAN GILBERT, a citizen of the United States of America, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Pendulum Scales, of which the following is a full, clear, and exact descriptio-n.

This invention relates to certain improvements in scales, and more particularly to scales of the class having a pivotal indicator, pendulum counterbalancing means, an operating connection between the counterbalancing means and the indicator and an intermediate lever interniediate the pendulum and the load to be counter-balanced.

Certain of the objects of the present invention reside in the provision of an exceeding compact scale of the above type, which will be simple .to manufacture, adjust and seal, and one which will maintain accuracy after .long periods of use.

Other objects reside in the provision of certain adjustment devices whereby the pendulum and indicatingdevices may be readily set to work with accuracy under varying conditions.

Another object resides in the provision of a novel form of driving connection between the indicator and the pendulum load counterbalanceing means. The connection is `of such acharacter that it may readily be adjusted to provide proper depth of enmeshment between the rack and pinion and proper enmeshment pressure between the same elements. The connection is also adapted to prevent damaging shocks being imparted to the indicating system when sudden loads are applied to the scale.

Other particular objects and advantages will be more fully pointed out in the accompanying specification and shown upon the drawings, in which: j

Fig. 1 shows a front elevation of my improved scale.

Fig. 2 shows a sectional side view of the sca-le.

The. scale operating parts are preferably housed in a dial housing and beam housing 11. The latter is provided with suitable brackets 12 to support the bearings which receive and support knife edges 13. These knife edges are carried by and form the fulcrum for an intermediate leve-r 14 of the. third order. Thislever may carry a tare 1920. Serial N0. 395,900.

beam 15 which is supported outside the housing by suitable studs which project through slots in the housing wall.

Beam 14 also carries knife edges 16 which support a` loop bearing carried by a steelyard 17 leading to the goods support or base lever system (not shown). The beam 141 likewise carries knife edge pivots 1S which coact with a loop bearing 19 having means for clamping thereto a pair of fiexible tapes 20.

Bolted to the dial housing is a frame Q1 which is provided with suitable bearings 22 for mounting the main pendulum carrying arms 223. a depending forked frame 24rcarrying pointed pins which support pairs of coacting overlapping rollersl 2G and 27. The edges of the rollers 26 and 27 are beveled and support an arbor 2S carrying a pinion 29. These rollers form a dise bearing support for the pinion arbor and allow the same to rotate with a` minimum of friction. Carried upon the end of the arbor 28 is a counterbalaneed pivotal indicator 30 which sweeps over a dial 30a carried by the dial housing. To prevent endwise movement of arbor 2S, it is preferably shouldered and this shouldered portion is adapted to abut against the discs--should the arbor move excessively endwise.

Pivotally fastened upon the main arms Q3 are seconda-ry arms 31 which are threaded to receive pendulum weights 32. These weights are adjustable. vertically relative to the secondary arms 3 1 andr after they are shifted to the desired vertical adjustment, they may be locked by means of set screws 33.

I' also provide means for adjusting the pendulum horizontally or angularly relative to the main arms 23. This adjustment is secured to give-and-take screws 34 which are carried by brackets 35 supported on the lower ends of the main arms 23. By adjusting the screws 34 in and out their ends will contact with the secondary pendulum weight arm 31 and thereby the weight arms and the pendulum thereon can be. adjusted and locked at any vdesiredrelative horizontal or angular position.

Pivoted upon the upper ends of the main arms 23 are adjustable compensating cams S6 to which are fastened the tapes 20.

Upon one of the main arms Q3 is a block Also fastened to frame Q1 is P lll) its opposite'end a. for-lied member 39carry-` downwardly-facing rack 40.

This rack meshes with the pinion. Yupon the arbor shaft and thereby imparts displacement to the pointer 30 in accordance with the displacement of the pendulum load- 1 counterbalancing means. Should a. load be suddenly placed upon the Ascale the spring 38 acts as ashoclr-absorber and prevents the shock of impact being suddenly imparted to the indicating system.

In orderto secure the properlight yielding pressure between vthe rack 40 andthe pinion 29 a spring 4l is utilized. This springv (here shown as a continuation of spring 88) is preferably of U-shape .and bears aga-inst a set screw 42 carried by the rack. By adjustingthis setfscrew. and vert-ically shifting the position. of spring 38 the depth of enmeshment ofthe rack may be changedw Thereafter the enmeshment pressure between the rack and pinion maybe varied by further adjustment of set screw 4l. In order to prevent the Vraclr vfrom jumping out ofmesh a forked blade 43 is provided which extends over-and is slightly` spaced from the rack as shown inv Fig. 2.

To bring the scale to proper Zero balance asuitable adjusting poise 44 may be utilized.

This poise is carried-@upon va threaded shaft which is` supported bythe main scale beam` 14; Oscillatio-ns of the beamare damped.

by means of a dash-pot 46S.`

In order to secure access to the pendulum.

and `indicator assemblyl for adjustment, the

dial housing is provided with a removable` closure A47. rI he .beam housing likewise is provided with a' removable closure 48.

` The operation of they improved yscale will4 be-readily understood. A downward pull `upon the draf-t rod rocks'lever 14 about its' fulcrum thereby drawing down tapes 20.-

Theseftapes then pull; downwardly. upon. the pendulum arms and elevate the weighted arms proportionally, to the load. thereon.

.The rack- 40 is then drawn to the left and rotates the p ivotal'indicator shaft to indi.-

cate on the'dialthe amount ofthe counterbalancedlo-ad,

Having ldescribed -a preferred embodiment of my invention whatV I desire to claim vis more `particularly pointed out in -the appended claims.,v y v 'y Iclaim:

. l. In a weighingv scale, in combination, a pivotal indicator, an` arbor-therefor, a pinion carried thereby, apendulum load counterbalancing means, means for displacing the `)ivo'tal indicator in accordance. with the disp acement of the pendulum load countering a pivot for a horizontally-extending.

lion carried, thereby a pendulum load counterbalancing means, means for displacing the indicator proportionally to thedisplacement of the loadcounterbalancing means, said meanscomprising.a spring connectedl to the pendulum'. mea-ns, ahorizontallfyextending raclr pivotally. supported. by said, spring, said rack engaging the.l aforesaid pinion, land a tension. device comprising a spring carried. by the first mentionedv spring, and a. setscrew carriedfby the rackand engaging the second mentioned. spring m'em.- ber for the purpose described. j

3. In a weighing scale, in combination, Aa. pendulum load counterbalancing means, a member adjustable vertically thereon, a spring carried by said. member, a horizon,- tally extendingrack coupled to said spring, a pinion engagedv by said lrack :and anl arbor and a. pivotal. indicator turned; therebyupon4 the lateral displacement ofthe rack, saidY adjustable support for said springpermitting the raclr tobe elevatedon depressed relatively to the pinion.

4. Ink aweighingscale, in combination, a pendulum. loadecounterbalancingv means in.- cluding a supportingfibrm. for a pendulum weight, a .shock-absorbingvspring carried .by and adjustable vertically relative to said arm, a horizontal-ly-extending rack. coupled to ysaid spring., a. pinion engaged thereby, a. pivotal indicator. connectedz'with said pinion, and .an adjustable. tension .spring .coactv ing with said rack, said springlastmen.- tioned `and the` shock Aabsorbing.spring..beingl adapted by adjustmentfthereof tocontrol...

the depth of enmeshm'ent oftheV rackand pinion .and they enmeshment pressure `there. between.

5. Ina weighing. scale, in'combination, a

acting with said blade spring to. vary theenmeshmentpressure. between. the rack. and pinion.

I6. In a weighing scale, in combination, a scale beam, a draft rodconnectedjthere-y to, a pair of pendulum .load-counterbal--.

ancing devices, each device comprising. ai

CII

compensating cam, a main arm, a secondary arm pivotally supported by the main arm and angularly adjustable relatively thereto, and a Weight carried by the secondary arm, and flexible tapes connecting the said compensating cams with the scale beam.

7. In a Weighing scale, in combination, a scale beam, adraft rod connected thereto, a pair of pendulum load-counterbalancing devices, bearings therefor disposed above the beam, each said device comprising a main pendulum arm, a compensating cam carried thereby and adjustable relatively thereto, a secondary arm pivotally supported on the main arm and adjustable angularly relatively thereto, and a pendulum Weight adjustable vertically relative to the secondary arm, and flexible tapes connecting the scale beam with the compensating cams which form part of the pendulum load-counterbalancing means.

8. The invention set forth in claim 6 in which a pivotal indicator and pinion is provided, and having a horizontal rack engaging the pinion and coupled with the pendulum load-countcrbalancing means.

9. The invention set forth in claim 6 iu which a pivotal indicator is provided to indicate the counterbalanced load and having a pinion connected with said indicator, a rack engaging the pinion and a shockabsorbing spring coupling the rack and the pendulum load-counterbalancing means.

10. In a Weighing scale, in combination, a. scale beam of the second order of leverage, a draft rod connected thereto, a pair of tapes connected to said beam, a pair of pendulums journaled above said beam and connected thereto by the aforesaid tapes, a pivotal indicator having an arbor, disc-bearing supports for said arbor, and means comprising a rack and pinion for coupling said indicator with one ofthe aforesaid pendulums.

11. In a scale, in combination, a dial housing, a frame carried thereby, pendulum bearings in said frame, a pair of disc bearings carried by said frame and supporting an arbor, a pivotal indicator and a pinion thereon, a pair of pendulums carried by the aforesaid bearings in said frame, a scale lever fulcrumed below the pendulum, a pair of tapes connecting the pendulum thereto, a horizontal rack meshing with the pinion, and shock-absorbing and tension-adjusting springs coupling the rack with the pendulum means and controlling the enmeshmeut pressure between the rack and pinion.

l2. A Weighing scale including in combination, a pivotal indicator, pendulum load counterbalancing means comprising a pair of pendulums, means for operating said pendulum load counterbalancing means in accordance with applied loads, and driving means for said pivotal indicator connected to the pendulum means, said driving means including a yielding shock absorbing connecting device having provisions adapted to permit the yielding of said driving connection in either direction upon the application of shock to the parts.

13. In a Weighing scale, in combination, a pivotal indicator, a scale beam, a pair of pendulum load counterbalancing devices, each device comprising a main arm, a secondary arm pivotally supported upon the main arm and angularly adjust-able relatively thereto, a Weight carried by the secondary arm, means connecting the pendulum devices with the beam, and driving devices for the pivotal indicator operated directly by and from said pendulum devices, said driving devices including a. yielding .blade-like spring operatively connected to the pendulum devices and adapted to yield in either direction upon the application of shocks to the parts.

In testimony whereof I hereto affix my signature.

WILLIAM NATHAN GILBERT. 

